Emma Pieczynska-Reichenbach (19 April 1854 – 10 February 1927) was a Swiss abolitionist and feminist born in Paris, France.

In Leukerbad she learned from the American doctor and suffragette Harriet Clisby, who familiarized her with the women's rights movement.

Her thesis, a work on sexual education, was first published in 1898 under the title L'école de la pureté (The School of the Pure).

Around the same time she met Josephine Butler, the founder of the International Abolitionist Federation, a group attempting to end prostitution.

In 1906 she helped establish the Swiss Consumer League, and in 1915 she participated in the National Education Commission.